Is this a pre-configured computer? Because, if it an off-the-shelf computer, or a custom built computer, the manufacturer loads all types of advertising crap on it.
This is the manufacturer's way of reducing their costs so that they can offer their products at a lower cost to the consumer.
Yes, it can be deleted by modifying the 'Hosts' file. But I must caution you that if you are not 100% sure of what you are doing, don't mess with it.